Weekly Engineering Quiz – CO Exposure Limits & Gas Detection Design
Category: Industrial Safety / Gas Detection
Standards Referenced: OSHA, NIOSH, ACGIH
Question
What is the recommended exposure limit (REL) for Carbon Monoxide (CO) as per NIOSH?
Technical Explanation
- NIOSH REL: 35 ppm (8-hour TWA)
- OSHA PEL: 50 ppm
- IDLH Level: 1200 ppm
Engineering Design Insight
- Low alarm setpoint: 25–35 ppm
- High alarm setpoint: 50–100 ppm
- Critical areas: DG rooms, basements, tunnels
Applicable Standards
- OSHA 29 CFR 1910.1000
- NIOSH Pocket Guide
- NFPA 720 (CO detection)